<template>
    <div>
    <!--头部面包屑-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图区域-->
        <el-card>
        <!--警告区域-->
            <el-alert title="注意只允许为第三级分类设置相关参数" type="warning" show-icon></el-alert>

        <!--选择商品分类区域-->
            <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!--选择商品分类的级联选择器-->
                <el-cascader
                expand-trigger="hover"
                :options="catelist"
                :props="cateProps"
                v-model="selectedCateKeys"
                @change="CateChange">
                </el-cascader>
            </el-col>
            </el-row>

        <!--tab 页面区域-->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag"
                                          v-if="scope.row.inputVisible"
                                          v-model="scope.row.inputValue"
                                          ref="saveTagInput"
                                          size="small"
                                          @keyup.enter.native="handleInputConfirm(scope.row)"
                                          @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEidDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板  -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag"
                                          v-if="scope.row.inputVisible"
                                          v-model="scope.row.inputValue"
                                          ref="saveTagInput"
                                          size="small"
                                          @keyup.enter.native="handleInputConfirm(scope.row)"
                                          @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="静态名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEidDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>


<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="30%"
  @close="addDialogClose">
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="30%"
  @close="editDialogClose">
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
    <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            catelist:[],
            //级联选择器的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
            },
            //级联选择器双向绑定的数组
            selectedCateKeys:[],
            //被激活页签的名称
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态属性的数据
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible:false,
            //添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[{
                    required:true,message:'请输入参数名称',trigger:'blur'
                }]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible:false,
            //修改的表单数据对象
            editForm:{},
            editFormRules:{
                attr_name:[{
                    required:true,message:'请输入参数名称',trigger:'blur'
                }]
            }

        }
    },
    created(){
        this.getCateList()
    },
    methods:{
       async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败')
            }
            this.catelist=res.data
            console.log(this.catelist);
        },
        //级联选择器发生变化，会触发这个事件
        CateChange(){
            this.getParamsData()
            
            
            // console.log(this.selectedCateKeys);
        },
        //Tab 页签点击点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
            console.log(this.activeName);
        },
        //获取参数列表数据
       async getParamsData(){
           // 证明选择的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            //证明选择的是三级分类
           const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
           if(res.meta.status!==200){
               return this.$message('获取参数失败')
           }
           //利用循环，让字符串变成数组
           res.data.forEach(item=>{
               item.attr_vals =item.attr_vals? item.attr_vals.split(' '):[]
               //控制文本框与添加按钮的显示与隐藏
               item.inputVisible=false
               //文本框中输入的内容
               item.inputValue=''
           })
           console.log(res.data);
           if(this.activeName==='many'){
               this.manyTableData=res.data
               console.log(this.manyTableData);
           }else{
               this.onlyTableData=res.data
               console.log(this.onlyTableData);

           }
        },
        //监听添加对话框的关闭事件
        addDialogClose(){
            this.$refs.addFormRef.resetFields()
        },
        //点击确认按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                // console.log(valid);
                if(!valid) return 
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.getParamsData()
                this.addDialogVisible=false
            })
        },
        //监听修改对话框的关闭事件
        editDialogClose(){
            this.$refs.editFormRef.resetFields()
        },
        //点击编辑按钮，展示修改对话框
       async showEidDialog(attr_id){
           //查询当前=参数信息
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{
                attr_sel:this.activeName
            }})
            // console.log(res.data);
            if(res.meta.status!==200){
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm=res.data
            this.editDialogVisible=true
        },
        //点击确认按钮，修改参数
    editParams(){
           this.$refs.editFormRef.validate(async valid=>{
               if(!valid)return 
               const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    })
                    if(res.meta.status!==200){
                        return this.$message.error('修改参数失败！')
                    }
                    // console.log(res.data);
                    this.editForm=res.data
                    this.getParamsData()
                    this.editDialogVisible=false
           })
                
        },
        //根据id删除对应的参数项
       async removeParams(attr_id){
             const confirmResult= await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                 confirmButtonText: '确定',
                 cancelButtonText: '取消',
                 type: 'warning'
        }).catch(err=>err)
        if(confirmResult!=='confirm'){
            return this.$message.error('已经取消了删除')
        }
        const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        // console.log(res.data);
        if(res.meta.status!==200){
            return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
        },
        //文本框失去焦点或摁下了 Enter 键，都会出发
       async handleInputConfirm(row){
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            //如果没有 return ，则证明输入的内容，需要做后续的处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            //需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },
        //将对 attr_vals 的操作，保存到数据库
       async saveAttrVals(row){
            const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            // console.log(res.data);
            if(res.meta.status!==200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功')
        },
        //删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        },
        //点击按钮，显示文本输入框
        showInput(row){
            row.inputVisible=true
            //让文本框自动活的焦点
            //$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
        });
        }
    },
    
    computed:{
        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        //如果选择的是三级分类，则返回三级分类的id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }else{return '静态属性'}
        }
    }
}
</script>

<style scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-tag{
    margin: 10px    ;
    margin-left: 15px;
    }
    .input-new-tag{
    width: 150px;
    }
</style>